CN108704960A - A kind of symmetrical expression four-roller roll bending control method - Google Patents
A kind of symmetrical expression four-roller roll bending control method Download PDFInfo
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- CN108704960A CN108704960A CN201810483099.3A CN201810483099A CN108704960A CN 108704960 A CN108704960 A CN 108704960A CN 201810483099 A CN201810483099 A CN 201810483099A CN 108704960 A CN108704960 A CN 108704960A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A kind of symmetrical expression four-roller roll bending control method, includes the following steps：The on-line monitoring of curvature, the online recognition of spring-go rule, the on-line prediction of final drafts and control.Roll bending intelligence is no longer rely on worker's experience, reduces labor intensity, improve production efficiency, ensure that roll bending precision by the present invention.The material mechanical performance of plate is not depended on, can identify in real time and corrects shaping law, forming is made to be optimal effect.The best roll bending control for meeting its working condition can be provided according to the appointed condition of different roll bending producers.
Description
Technical field
The invention belongs to machinery fields, are related to a kind of symmetrical four-roller roll bending Intelligent Control Strategy.
Background technology
Plank bending has a wide range of applications in the fields such as automobile, farm machinery, aerospace, instrument and meter.Bending
Most distinct issues are during rolling the drip molding of specific curvature in forming technology, and punch-pin down stroke and span are difficult to
Precisely controlled, this is difficult to control correlated variables, to obtain the drip molding of exact curvature.The influence factor of curvature has very
It is more, even the same trade mark, the plank with batch, since the fluctuation of material property and process conditions can also make the curvature of bool
It varies widely.Traditional mode relies primarily on Die plate paper to detect desired value, and corrects step by step, which can cause
The problem of component shaping number is excessive, working efficiency is low etc., when plank specification and material change, detection template needs to make again
Make, complex procedures.It is real in order to which punch-pin drafts and span are difficult to accurately control when solving the problem of to roll specific curvature workpiece
Existing novel four-roller roll bending intelligentized control method, this patent propose a kind of symmetrical four-roller roll bending Intelligent Control Strategy.
Invention content
The purpose of the present invention is to provide the high symmetrical four-roller roll bending controlling parties of a kind of production efficiency height, forming accuracy
Method.
The invention mainly comprises the on-line monitoring of curvature, the on-line predictions of the online recognition of spring-go rule, final drafts
And four steps of control, the specific method is as follows：
1. the on-line monitoring of curvature：Using measuring center as coordinate origin, measuring center to the direction of measurement point 1 is the directions x
Establish coordinate system.In coiling process or after rolling completion, using three location points of sensor measurement cylindrical member, three are obtained
The coordinate of a location point, respectively (ρ1,0)、(ρ2 cosα1,ρ2 sinα1) and (ρ3 cos(α1+α2),ρ3 sin(α1+α2)),
Middle ρ1、ρ2、ρ3Respectively three measurement points are to the distance of measuring center, α1、α2Respectively measurement point 2 and measurement point 1 and measurement point 3
Between the corresponding central angle of circular arc.Central coordinate of circle is (x0,y0).It brings three coordinate points into round equation, can obtain
The center of circle (x can be acquired0,y0) and radius of curvature r.
2. the online recognition of spring-go rule：Data accumulation through many experiments and numerical simulation, in symmetrical four-roller roll bending
It in technique, is determined with lower die span one periodically in mat material, the curvature of upper roller drafts and cylindrical member is in One- place 2-th Order function
Relationship, universal relation formula be K (h)=ah2+ bh+c, h are upper roller drafts, and K (h) is the curvature of cylindrical member.
In order to determine three coefficients a, b, c in general expression, need to carry out experiment three times.In view of actually detected and tool
Gymnastics is made, and the determination principle of drafts is three times：The value of the drafts of first time is greater than elastic limit drafts he；For the third time
The drafts h that the value of drafts is spring-go front curve curvature when being target curvature0, can guarantee that plate is curved after paper three times in this way
Curvature does not exceed target curvature；Secondary drafts is between first time and third time.According to the above principle, setting
For the first time, second, the drafts of third time paper is respectively h1=(3he+h0)/4、h2=(3he+5h0)/8、h3=h0, formula
In, heFor elastic limit drafts, h0The pressure that value for third time drafts is spring-go front curve curvature when being target curvature
Amount.Drafts-curvature data is tentatively established by the forming curvature of the paper three times of the drafts and on-line monitoring of paper three times
Library.In production practices excessively, suitable lower roll span is selected, paper determines three groups of upper roller drafts and curvature data, band three times
Enter into the universal relation formula of upper roller drafts and curvature, you can determine three coefficients a, b, c.
3. the on-line prediction of final drafts：The final drafts h of forming target curvature is calculated according to following formulam
In formula, a, b and c are coefficient, K0For shaped objects curvature.
4. control：It is controlled using self-adapting closed loop, i.e., it is discontented when walking the forming curvature that final drafts obtains using third
When sufficient required precision, drafts this time is added to forming curvature data in drafts-curvature data library, is intended again
Close relational expression K (h)=ah of drafts and curvature2+ bh+c, in formula, a, b and c are coefficient, and h is upper roller drafts, and K (h) is cylinder
The curvature of shape part after obtaining new relation formula, is recalculated the final drafts of forming target curvature, is rolled up with new final drafts
System, is such as unsatisfactory for required precision, repeats the above steps.
Compared with the prior art, the present invention has the following advantages：
1. due to the experience for fully relying on roll bending worker in actual production, estimation drafts carries out paper, labor intensity
Greatly, efficiency is low, and roll bending precision is not easy to ensure；And the present invention is used, by roll bending intelligence, it is no longer rely on worker's experience, is reduced
Labor intensity improves production efficiency, ensure that roll bending precision.
2. in actual production, after plate batch changes, material mechanical performance can also fluctuate, according to production
The accumulation data of database, can bring certain error；And the control strategy of the present invention is the mechanics of materials for not depending on plate
Can, it can identify in real time and correct shaping law, forming is made to be optimal effect.
3. using the present invention, the best volume for meeting its working condition can be provided according to the appointed condition of different roll bending producers
Plate controls.
Description of the drawings
Fig. 1 is the relational graph of ST12 cold-reduced sheets drip molding curvature and drafts under different half spans.
Fig. 2 is the relational graph of 304 stainless steels drip molding curvature and drafts under different half spans.
Fig. 3 is the stress sketch of slab.
Fig. 4 is geometrical relationship figure in bending process.
Fig. 5 is radius of curvature measurement schematic diagram.
Fig. 6 is intelligent control strategy flow chart
In figure：1. upper roller, 2. drip moldings, 3. lower rolls.
Specific implementation mode
Embodiment 1
Two kinds of materials of ST12 cold-reduced sheets and 304 stainless steel plates are selected, the thickness of plate is 2mm, length 500mm, width
For 100mm, symmetrical four-roller rolling machining is carried out.According to drafts in Tables 1 and 2 and half span of lower roll respectively to ST12 cold rollings
Plate and 304 stainless steel plates carry out edge rolling, and measure the curvature of every group of data lower mandrel member.Finally, using K (h)=ah2+ bh+c letters
Number relational expression is fitted curvature and drafts relation data point, obtains the change curve of curvature and drafts, such as Fig. 1 and 2
It is shown.As seen from the figure, for the coefficient of determination of matched curve close to 1, fitness bias is smaller, illustrates ST12 cold-reduced sheets and 304
For stainless steel plate during symmetrical four-roller roll bending, the relationship of curvature and drafts can pass through K (h)=ah2+ bh+c functional relations
Formula is described.
Corresponding curvature (ST12 cold-reduced sheets) (mm under the different upper roller drafts of table 1 and half span of lower roll-1)
Corresponding curvature (304 stainless steel) (mm under the different upper roller drafts of table 2 and half span of lower roll-1)
Example 2
The upper roller radius of symmetrical four-roll plate bending machine is 40mm, and lower roll radius is 50mm, and the initial distance of center circle of up-down rollers is
82mm.Select thickness for 2mm, length 942mm, the ST12 cold-reduced sheets that width is 100mm carry out edge rolling, and yield stress is
195MPa, elasticity modulus 202GPa.Veneer reeling machine parameter is set, and half span of upper roller is 30mm, and half span of lower roll is 80mm.Tubular
The target curvature of part is 6.667 × 10-3mm-1.According to fig. 3 with Fig. 4 and mechanics of materials knowledge, it is known that the elastic limit pressure of slab
Lower amount heWith bending curvature be target volume koji-making rate when drafts h0It can be expressed as
In formula, E is elasticity modulus, σsFor yield stress, L is lower roll span, RdFor lower roll radius, t is thickness, and α is upper roller
Corner at fulcrum, ρ0For desired radius of curvature, H is initial up-down rollers distance of center circle, and β is slab and corner at punch-pin point of contact, L1And L2
Respectively half span of half span of upper roller and lower roll.
H can be calculatede=3.33mm, h0=11.2mm.
By elastic limit drafts heWith bending curvature be target volume koji-making rate when drafts h0Bring first time, second into
Secondary and third time paper drafts h1=(3he+h0)/4、h2=(3he+5h0)/8、h3=h0In, you can obtain paper three times
Drafts, as shown in table 3.
Three location points in the cylindrical member that paper obtains three times, including corner are measured by displacement sensor and angular transducer
α1=30 °, α2=30 ° and distance ρ1=125.36mm, ρ2=146.33mm, ρ3=167.86mm, as shown in Figure 5.It will turn above
Angle and distance are brought intoDrip molding curvature can be obtained,
As shown in table 3.By three groups of drafts and drip molding curvature data, to drafts and drip molding curvature relationship formula K (h)=ah2+
Bh+c is fitted, and it is respectively 3.95 × 10 to obtain a, b, c-5、5.36×10-5、-5.65×10-4, to obtain drafts with
Drip molding curvature relationship formula.By target curvature 6.667 × 10-3mm-1It brings into relational expression, obtains rolling drafts 13.2mm, pass through
After rolling, the drip molding curvature of acquisition is 6.3 × 10-3mm-1, relative error 5.4%, precision is poor.
According to the relation data of paper three times and 4 groups of drafts and drip molding curvature rolling, fit correlation again
Formula K (h)=ah2+ bh+c, it is respectively 3.86 × 10 to obtain a, b, c-5、5.63×10-5、-5.68×10-4, to be depressed
Amount and drip molding curvature new relation formula, then by target curvature 6.667 × 10-3mm-1It brings into new relation formula, obtains amendment and roll
Drafts 13.4mm.It corrects again after rolling, the drip molding curvature of acquisition is 6.65 × 10-3mm-1, relative error 0.3%,
Precision is preferable, and it is symmetrical four-roller roll bending Intelligent Control Strategy flow chart that specific data, which are shown in Table 3, Fig. 6,.
3 intelligentized control method process measurement of table
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can realize in other embodiments without departing from the spirit or scope of the present invention, such as at other
In the roll bending technique of form.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to and this
The consistent widest range of principle and features of novelty disclosed in text.
Claims (1)
1. a kind of symmetrical expression four-roller roll bending control method, it is characterised in that：The on-line monitoring of curvature, the online knowledge of spring-go rule
Not, the on-line prediction of final drafts and control, the specific method is as follows：
(1) on-line monitoring of curvature：Using measuring center as coordinate origin, measuring center to the direction of measurement point 1 is established for the directions x
Coordinate system in coiling process or after rolling completion, using three location points of sensor measurement cylindrical member, obtains three positions
Set coordinate a little, respectively (ρ1,0)、(ρ2cosα1,ρ2sinα1) and (ρ3cos(α1+α2),ρ3sin(α1+α2)), wherein ρ1、ρ2、
ρ3Respectively three measurement points are to the distance of measuring center, α1、α2Circle respectively between measurement point 2 and measurement point 1 and measurement point 3
The corresponding central angle of arc, central coordinate of circle are (x0,y0), it brings three coordinate points into round equation, can obtain
The center of circle (x can be acquired0,y0) and radius of curvature r；
(2) online recognition of spring-go rule：Data accumulation through many experiments and numerical simulation, in symmetrical four-roller roll bending technique
In, it is determined with lower die span one periodically in mat material, the curvature of upper roller drafts and cylindrical member is in the pass of One- place 2-th Order function
System, universal relation formula are K (h)=ah2+ bh+c, h are upper roller drafts, and K (h) is the curvature of cylindrical member,
In order to determine three coefficients a, b, c in general expression, need to carry out experiment three times, it is contemplated that actually detected and specific behaviour
Make, the determination principle of drafts is three times：The value of the drafts of first time is greater than elastic limit drafts he；Third time is depressed
The drafts h that the value of amount is spring-go front curve curvature when being target curvature0, can guarantee that bending of the plate three times after paper is bent in this way
Rate does not exceed target curvature；Secondary drafts, between third time, according to the above principle, sets first between for the first time
It is secondary, second, the drafts of third time paper be respectively h1=(3he+h0)/4、h2=(3he+5h0)/8、h3=h0, in formula, he
For elastic limit drafts, h0The drafts that value for third time drafts is spring-go front curve curvature when being target curvature leads to
The forming curvature for crossing the paper three times of the drafts of paper three times and on-line monitoring tentatively establishes drafts-curvature data library,
In production practices excessively, suitable lower roll span is selected, paper determines three groups of upper roller drafts and curvature data three times, is brought into
In the universal relation formula of roller drafts and curvature, you can determine three coefficients a, b, c；
(3) on-line prediction of final drafts：The final drafts h of forming target curvature is calculated according to following formulam
In formula, a, b and c are coefficient, K0For shaped objects curvature；
(4) it controls：It is controlled using self-adapting closed loop, i.e., is unsatisfactory for essence when walking the forming curvature that final drafts obtains using third
When degree requires, drafts this time is added to forming curvature data in drafts-curvature data library, again fitting pressure
Relational expression K (h)=ah of lower amount and curvature2+ bh+c, in formula, a, b and c are coefficient, and h is upper roller drafts, and K (h) is cylindrical member
Curvature, after obtaining new relation formula, recalculate forming target curvature final drafts, rolled with new final drafts,
It is such as unsatisfactory for required precision, is repeated the above steps.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111136134A (en) * | 2020-01-03 | 2020-05-12 | 中国航空制造技术研究院 | Forming device and forming process for obtaining curved ribbed wallboard |
| CN112676376A (en) * | 2020-12-30 | 2021-04-20 | 南通铭泰机床有限公司 | Method and system for improving control precision of numerically controlled plate bending machine |
| CN114619203A (en) * | 2021-12-24 | 2022-06-14 | 钢一控股集团有限公司 | Forming method of large-diameter stainless steel pipe |
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